We can see exactly the same example in eq. (3.2) in [1]} where \(c\)  in eq. (REF ) is taken to be \(+1\)  and \(M^2\)  is called \(\Lambda ^2\) . However, in the recent paper [2]} two of the authors of [1]} argued that the sign of \(c\)  in eq. (REF ) has to be negative for the consistency of their ERG equations.
